Holdback for sleds



. P. DICKSON.

Sled-Brake.

Patented Apr. 27, 1852.

AM PHOTO-LITHO. [20- N.Y. (OSBCRNES PROCESS) PERRY DICKSON, OF BLOOMINGVALLEY, PENNSYLVANIA.

HOLDBACK FOR SLEDS.

Specification of Letters Patent No. 8,903, dated April 27, 1852.

To all whom it may concern:

Be it knownthat I, PERRY Dickson, of Blooming Valley, in the county ofCrawford and State of Pennsylvania, have invented a new and usefulImprovement in the Holdbacks of Sleds; and I do hereby declare that thefollowing is a full, clear, and exact description of. the same,reference being had to the accompanying drawings, forming part of thisspecification, in which- Figure 1, is a plan of a sled to which theimprovement is applied. Fig. 2, is a longitudinal elevation of the same.Fig. 3, is alongitudinal section of the same.

Similar letters of reference indicate corresponding parts in each of theseveral fig- A, is the sled. g B, is the roller which is square, andturns upon pivots b, b, whlch are placed as far as possible downward andbackward from its center.

C, C, are the dogs, which are secured by clamp bolts a, to the upperside of the roller opposite the hounds of the tongue; they are ofsuificient length to allow of their ends, which are hooked,to enter thesnow or ice, when the roller is turned back far enough to bring them toan angle of to the sur face. The front end of each dog has a. hinge eyeformed upon it which stands above and in front of the roller.

D, is the tongue, to the bounds (Z, (Z, of which are secured plates E,E, on the undersides of whichare eyes which fit to, and form hingejoints 6, with the eyes on the front ends of the dogs. The back parts f,f, of the plates E, extend over the front parts of the dogs, which areupon the roller, and form stops, against which the dogs and roller rest,and are kept rigid with the tongue while drawing.

The operation is as followsin drawing, the dogs are held up to theposition shown in Fig. 2, as the draft acting on the hinges 6, turnsthe'roller over forward; but in descending an inclined surface,where thesled has a tendency to run faster than is consistent with safety, theslightest cessation of draft on the part of the animal, will cause theroller to turn over backward and drive the dogs into the ground asrepresented in Fig. 3. In stopping the sled on a level surface the sameeffect will be produced by the stopping of the animal; but on theslightest draft being applied to the tongue the dogs are raised and thesled is left free to run onward. In backing, when necessary, the formand position of the teeth of the dogs, allow them to slide freely overthe ground.

I do not claim connecting the dogs with, and operating them by thebackward pressure of the tongue, but

I claim as my invention and desire to se-- cure by Letters Patent, asbeing moresimple than the ordinary means by which this is effected,

Attaching the dogs 0, C, to the roller B, rigidly, instead of totherunners as is usual, and connecting the tongue to the said roller byhinges or analogous joints, in such a manner that the backward motion ofthe tongue in relation to the body of the sled, turns the roller on itsaxis and forces the points of the dogs so attached to it into the snowor ice of theroad, substantially as and for the purpose herein setforth.

PERRY DICKSON.

Witnesses DAVID NELSON, Coornn RAY,

